How to get the scaling byte for the pid used in Mode 21 or Mode 22? I have searched and read the SAE J2190 stating Mode 24 can be used to get info on the Mode 21/22 pids but the KWP 2000 14230-3 document doesn't state any mode 24. Is the Mode 24 for KWP2000 or CAN?

I am using ATSP5 which is KWP 2000 14230 fast protocol, and can connect via ATSH8110FC header.
e.g. >81 (start comm)
C1 5D 8F 3C

also with

>2211000401 (get valid pid list)
62 11 00 EC 09 41 41 7D

>2212010401 (get rpm?)
62 12 01 00 65 6B


when I send
>24FF1201 (FF - offset unknown)
7F 24 11 83 (11 - service not supported)


What is the service ID to get the scalingbyte for the mode 21 / 22 PIDs?


Please help..

Many Thanks!